Anorectal pain and suffering is the most common symptom of anorectal diseases occurring, due to anatomy and physiology, the pain and suffering of anorectal diseases mostly occur in the lower abdomen, perineum, anal margin and lower rectum. Clinical examination: 1, performance of rectal some functional disorders, mostly clinical manifestations of light UC, although there is a tendency to recurrent attacks, but also self-limiting. 2, because the lesion is located only in the rectum, it is quite characteristic, with lower abdominal pain, constipation, a small amount of bleeding triad of proctitis. 3. Mucosal exudation and bleeding are often attached to the surface of the stool. 4, sometimes bleeding becomes the main manifestation, and the diagnosis of hemorrhagic proctitis is quite common. 5, the general symptoms are mild, less weight loss, anemia, hypoproteinemia, etc. Ancillary tests: 1, anal examination The purpose is to exclude the front and back of the rectum left and right walls for pressure pain, masses and stenosis, finger sleeve without blood as well as mucus, no special smell. 2, buffer fluid Reflect the total buffering capacity of the body’s acid-base imbalance. Arterial blood is drawn and measured with blood gas analyzer. 3.Endoscopy Sending into the body from outside the body through the natural cavity of the body to examine the disease in the body, it can directly observe the lesion in the internal cavity of the organ, determine its location and scope, and can be photographed, biopsied or brushed, which greatly improves the accuracy of cancer diagnosis and can be used for certain treatment.